Sandwich material has undulations inland of paper and the outer protection by plastic film and 1995 of embodiment of such a material

摘要

PCT No. PCT/CH85/00001 Sec. 371 Date Sep. 9, 1985 Sec. 102(e) Date Sep. 9, 1985 PCT Filed Jan. 10, 1985 PCT Pub. No. WO85/03030 PCT Pub. Date Jul. 18, 1985.The invention is primarily concerned with a sandwich material (55) made of sheets based on paper. This material is substantially comprised of a sheet (42) of corrugated paper (44) forming one or several layers. An intermediate paper sheet (31) is bonded to the corrugations of the sheet 42. A film (29) of a thermoplastic compound adheres physically as the result of an extrusion to the outer side of the intermediate paper sheet (31). The process for manufacturing this material consists firstly in extruding a film (29) of thermoplastic compound on the intermediate paper sheet (31), and then in bonding the web (27) of protective layer thus obtained on the corrugations of the sheet of corrugated paper (42). The invention is remarkable in that these operations are carried out on a standard machine for manufacturing corrugated paperboard. However, on the one hand an adhesive setting instantly at room temperature is used, and on the other hand the various heating elements used to bring about the setting of adhesives polymerizing through an endothermic reaction are kept switched off. The invention is particularly useful for making furniture or wall panels.